The primary item is the urn (Kalash), usually earthen, containing the ashes. Other items often used in the accompanying puja include flowers, incense, ghee, rice grains, black sesame seeds, Gangajal (Ganges water), and sometimes cloth. Yes, all necessary puja materials (samagri) are easily available in shops around the Ghats and temple areas in Haridwar. Many service packages include the cost of these materials.